/**
 * 
 */
package com.gzceb.zhgjj.security;

import java.util.Collection;
import java.util.Iterator;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;

/**
 * <p>
 * 字符串实用类。
 * </p>
 * 
 * @date 2012-10-23上午9:28:36
 * @author user
 * @description
 */
public class MyAccessDecisionManager implements AccessDecisionManager {

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.springframework.security.access.AccessDecisionManager#decide(org.
	 * springframework.security.core.Authentication, java.lang.Object,
	 * java.util.Collection)
	 */
	@Override
	public void decide(Authentication authentication, Object object,
			Collection<ConfigAttribute> configAttributes)
			throws AccessDeniedException, InsufficientAuthenticationException {
		// TODO Auto-generated method stub
		if (configAttributes == null) {
			return;
		}

		Iterator<ConfigAttribute> ite = configAttributes.iterator();
		while (ite.hasNext()) {
			ConfigAttribute ca = ite.next();
			String needRole = ((SecurityConfig) ca).getAttribute();

			// ga 为用户所被赋予的权限。 needRole 为访问相应的资源应该具有的权限。
			for (GrantedAuthority ga : authentication.getAuthorities()) {

				if (needRole.trim().equals(ga.getAuthority().trim())) {

					return;
				}

			}
		}

		throw new AccessDeniedException("");

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.springframework.security.access.AccessDecisionManager#supports(org
	 * .springframework.security.access.ConfigAttribute)
	 */
	@Override
	public boolean supports(ConfigAttribute attribute) {
		// TODO Auto-generated method stub
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.springframework.security.access.AccessDecisionManager#supports(java
	 * .lang.Class)
	 */
	@Override
	public boolean supports(Class<?> clazz) {
		// TODO Auto-generated method stub
		return true;
	}

}
